AKG Acoustics:

The AKG CU400 is a high-performance drop-in-style battery charger for WMS450 and WMS470 series wireless handheld and body-pack transmitters. The charger's design and the integrated charging contacts of the transmitter conveniently eliminate the need to remove the battery before charging; simply drop the entire transmitter into the slot.
The charger monitors battery voltages and temperatures during charging and automatically ends the cycle when the batteries are fully charged....

The CU700 is a charger that rapidly boosts the rechargeable batteries inside the transmitter without damaging the cells' elements. The CU700 charger determines the optimum charge current and has a quiet cooling fan to control the temperature of the cells. Integrated charging contacts allow the batteries to remain inside the transmitter while charging on the CU700.
The CU700 charger uses pulse technology, in which a pulse is fed to the battery. With pulse charging, high instantaneous voltages...

In the world of pro audio, AKG microphones and headsets have been synonymous with excellence for several decades. Around the world recording studios, radio and TV stations, opera houses and famous stages count on AKG products. Internationally known musicians and show-stars have frequently been seen using their high-quality microphones and headphones for many decades. Today AKG is one of the leading manufacturers of high-quality large diaphragm condenser studio microphones, boundary mics, headsets, headphones and wireless broadcast systems.